added sequence-specific code (create, drop and nextval)

include/matador/sql/dialect.hpp

@@ -145,6 +145,7 @@ public:
   [[nodiscard]] const std::string& end_binary_data() const;
   [[nodiscard]] const std::string& end_quote() const;
   [[nodiscard]] const std::string& end_string_data() const;
+  [[nodiscard]] const std::string& exists() const;
   [[nodiscard]] const std::string& foreign_key() const;
   [[nodiscard]] const std::string& from() const;
   [[nodiscard]] const std::string& group_by() const;
@@ -157,6 +158,7 @@ public:
   [[nodiscard]] const std::string& join() const;
   [[nodiscard]] const std::string& like() const;
   [[nodiscard]] const std::string& limit() const;
+  [[nodiscard]] const std::string& nextval() const;
   [[nodiscard]] const std::string& not_() const;
   [[nodiscard]] const std::string& not_null() const;
   [[nodiscard]] const std::string& offset() const;
@@ -171,6 +173,7 @@ public:
   [[nodiscard]] const std::string& schema() const;
   [[nodiscard]] const std::string& select() const;
   [[nodiscard]] const std::string& set() const;
+  [[nodiscard]] const std::string& sequence() const;
   [[nodiscard]] const std::string& start_quote() const;
   [[nodiscard]] const std::string& string_quote() const;
   [[nodiscard]] const std::string& table() const;
@@ -192,6 +195,7 @@ private:
 
   std::string default_schema_name_;
 
+
   token_to_string_map tokens_ {
     {dialect_token::AddConstraint,  "ADD CONSTRAINT"},
     {dialect_token::Alter,       "ALTER"},
@@ -215,6 +219,7 @@ private:
     {dialect_token::EndBinaryData, "'"},
     {dialect_token::EndQuote, "\""},
     {dialect_token::EndStringData, "'"},
+    {dialect_token::Exists,      "EXISTS"},
     {dialect_token::ForeignKey,  "FOREIGN KEY"},
     {dialect_token::From,        "FROM"},
     {dialect_token::GroupBy,     "GROUP BY"},
@@ -227,6 +232,7 @@ private:
     {dialect_token::Join,        "LEFT JOIN"},
     {dialect_token::Like,        "LIKE"},
     {dialect_token::Limit,       "LIMIT"},
+    {dialect_token::NextVal,     "NEXTVAL"},
     {dialect_token::None,        ""},
     {dialect_token::Not,         "NOT"},
     {dialect_token::NotNull,     "NOT NULL"},
@@ -242,6 +248,7 @@ private:
     {dialect_token::Schema,      "SCHEMA"},
     {dialect_token::Select,      "SELECT"},
     {dialect_token::Set,         "SET"},
+    {dialect_token::Sequence,    "SEQUENCE"},
     {dialect_token::StartQuote,  "\""},
     {dialect_token::StringQuote, "'"},
     {dialect_token::Table,       "TABLE"},
@@ -250,7 +257,6 @@ private:
     {dialect_token::Values,      "VALUES"},
     {dialect_token::Where,       "WHERE"}
   };
-
   data_type_to_string_map data_types_ {
     {utils::basic_type::Int8, "TINYINT"},
     {utils::basic_type::Int16, "SMALLINT"},